My mate's wife has a 06 hyosung GV650 and earlier she was riding when it back fired, Lost power then stalled and wouldn't start again. It would crack however. I'm heading over there tomorrow to troubleshoot and hopefully find a fix but any helpful tips, info or anything would help. extra info: bike at one point was just sitting around for a year or so, (been ridden and fix since tho) close to 60,000 kms on the clock. HAS spark & compression. Battery is fine. What gives? Yess hyo life, blah blah. lol Anyways, cheers in advance.